Just another data point proving the discrepancy between EI availability on UA and what is available through BA . Checked UA for EI availability in late Aug for BOS-DUB and DUB-BOS. UA showed 4 seats in Y for each trip. I called BA and booked 2 seats in Y using Avios. Hung up the phone and went back and checked the UA site for availability and there was nothing available on my dates.